Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  shrillness(noun) the quality of being sharp or harsh to the senses. the shrillness of her hair color. 2  shrillness, stridence, stridency(noun) having the timbre of a loud high-pitched sound.
VPN connectivity overview. A virtual private network, also known as a VPN, is a private network that extends across a public network or internet. It enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.
The first step to security is usually a firewall between the client and the host server, requiring the remote user to establish an authenticated connection with the firewall. Encryption is also an important component of a secure VPN.